Utility scale

offshore energy storage

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The Ocean Battery is a scalable, modular solution for utility scale energy storage that is produced by renewable sources such as wind turbines and floating solar farms at sea. Ocean Battery is a pumped hydro system in a box that provides eco-friendly utility scale energy storage up to GWh scale. The mechanism is based on hydro dam technology, that has proven itself for over a century as highly reliable and efficient.

To store energy, the system pumps water from the rigid reservoirs into the flexible bladders on the seabed. Now the energy is stored as potential energy in the form of water under high pressure. When there is demand for power, water flows back from the flexible bladders to the low pressure rigid reservoirs. Driving multiple hydro turbines to generate electricity.

Discover the unique advantages of the Ocean Battery

Offshore energy storage at the source

Offshore Storage

Ocean battery provides utility scale energy storage at the source, it can be deployed in existing and new offshore wind farms. In this way we can reduce local peak loads in the network and optimally match supply and demand.

Reliable and Affordable energy storage

Reliable & Affordable

By applying proven hydro dam technology, we can guarantee a long lifetime of decades and a high round-trip efficiency up to 80%. This makes our technology reliable and affordable.

Ecofriendly offshore energy storage

Eco Friendly

Our technology is sustainable and eco-friendly, the Ocean Battery does not require rare earth materials and uses clean water as the energy carrier. The structure is designed to enhance marine life.

Energy when we need it and where we need it

Producing renewable energy is crucial for a climate neutral economy. This energy transition requires a significant change in the energy system. More and more solar and wind turbine parks are being realized onshore and offshore to contribute to a sustainable society.

The planned global production of offshore wind, for the year 2050, exceeds 1150 gigawatts. Soon, weather conditions will dictate the timing of renewable energy production, causing large fluctuations.

To grow to a system where renewable energy is the norm, the biggest hurdle must be solved: energy storage. At Ocean Grazer, we tap into this huge potential of renewable energy by introducing the Ocean Battery. We are ready to meet future utility scale energy storage needs.

Products and Services

Ocean Battery is the first, scalable and eco-friendly utility scale energy storage solution to store renewable energy where it is produced, offshore.

Ocean Energy Consultancy offers innovative out-of-the-box solutions for development and engineering of renewable energy for offshore applications.

Ocean Power converts wave energy into electricity, using innovative floater blankets that are adaptable to each incoming wave  that maximizes the power output.

Our Company

Ocean Grazer is a Dutch start-up and a spinoff from the University of Groningen. Since 2014, the Ocean Battery has been in development at the University of Groningen. Over 100 students graduated so far have worked on relevant topics: developing predictive models, building experimental prototypes and more.

Meet the Team

Since 2018 Ocean Grazer is turning knowledge and intellectual property into commercial products. The start-up located in Groningen, the Netherlands, is led by Frits Bliek (CEO) and Max Duursma (COO): two professionals with over 20 years of experience in the maritime and energy sector, and Marijn van Rooij (CTO), who has spent 5 years to research regarding the Ocean Battery concept. Currently, Ocean Grazer is focusing on bringing the innovative Ocean Battery to the market

At Ocean Grazer, we are convinced hybrid systems will play a key part in commercial, sustainable and clean energy production. This is why we believe that Ocean Grazer B.V. can create a healthy future, both ecologically and economically, offering many growth opportunities along the way.

Are you a market investor, business owner, technology innovator, student? Are you ready to explore? Contact us for more information. 

Also check out our vacancy site for the open positions within our company

Join Us at
Ocean Grazer


Our projects are co-financed by the European Union, the European Regional Development Fund, the SNN (Samenwerkingsverband Noord-Nederland, Northern Netherlands Alliance), the Province of Groningen and several other parties and partners.

Learn more about the Ocean Battery pilot project.